Posted in | Strain Gauges

Aircraft Foil Strain Sensors: Model DTD2684 Series

Columbia’s Foil Strain Sensors are more accurate than previous, less accurate counting accelerometer systems when measuring the fatigue stress encountered by aircraft under varied circumstances of speed, weight and mission configuration.

These sensors provide more precise monitoring of important undercarriage components and surfaces for possible fatigue damage caused by high-stress maneuvers, thousands of flying hours and landings. These sensors are also appropriate for normal laboratory applications due to their simplicity and dependability.

These sensors come with a variety of sensitive axis orientations to choose from.

The DTD2684 -1, -2, -3, -4, -5 sensors are flight-qualified and have been the industry standard since their introduction in the early 1980s. Models DTD2684-11, -12, -13, -14 have the same precision, robustness and convenience of installation but with a different sensitive axis direction.

Models for compensating materials typically utilized in aircraft structural production are available. The Columbia Model 5802 Strain Gage Amplifier is used to boost sensor readings and provide strain and temperature outputs.

Note: Exports from the United States are subjected to the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) authorization procedures.

  • Flight Qualified
  • High Output — Two Active Arms
  • Ease of Installation
  • Choice of Sensitive Axis Orientation

Specifications

Operational

Table 1. Source: Columbia Research Laboratories, Inc.

Operational 1 Series DTD2684
Input Resistance 1000Ω, ±2%
Sensitivity 1.025 (±1 %) mV/V/1000 μϵ
Rated Excitation Voltage 10.0 VDC
Linearity ±0.5% Max.
Zero Offset ±0.5 mV/V Typ.
Operating Range -3500 to +5000 μϵ
Output Resistance 1000Ω, ±2%
Sensitivity Shift ±0.013%/°F
Hysteresis, Repeatability ±0.5% Max.
Zero Shift ±0.00025 mV/V/°F Typ.
Creep <0.5%, 5 Min. @ 5000 μϵ

 

Environmental

Table 2. Source: Columbia Research Laboratories, Inc.

Environmental 2 Series DTD2684
Temperature Range -54° to +125 °C
Vibration 30 g, 10 Hz to 2 KHz
Humidity MIL-STD-202 Method 103B
Salt Spray MIL-STD-202 Method 101D (168 Hours)
Insulation Resistance 100 Meg. min @ 500 VDC
Dielectric Strength 1050 VRMS, 60 Hz, 1 Min.
Altitude Sea Level to 70,000 Ft.
Flammability MIL-STD-202 Method 111A
Shock 100 g, 11 mSec
Fluids Resistance to short term exposure to fuel, lubricating oils and hydraulic fluids

 

Physical

Table 3. Source: Columbia Research Laboratories, Inc.

Physical Series DTD2684
Size 0.560" x 0.560” x 0.150" Thick
Encapsulation Silicone Rubber per MIL-S-23586A Type I, Class 2, Grade A
Weight Approx. 13 gms (Depending on the length of the leads)
Matrix 0.001" Polyimide
Leads #26AWG, Teflon Ins, SPC, 12" Min.

 

1 @25 °C. 2 Installed Gage

Schematic Diagram

Aircraft Foil Strain Sensors: Model DTD2684 Series

Image Credit: Columbia Research Laboratories, Inc.

Typical Installation of Old Style Strain Gages. 1. Bolt or rivet removed from assembly; 2. Dummy gage(s) bonded to “Z Tab” of same material as structure; 3. Active gage bonded to structure under test; 4. “Z Tab” mounted to structure with bond or rivet; 5. Strain gage leads interwired and soldered to junction block; and 6. Entire unit covered with protective material.

Typical Installation of Old Style Strain Gages. 1. Bolt or rivet removed from assembly; 2. Dummy gage(s) bonded to “Z Tab” of same material as structure; 3. Active gage bonded to structure under test; 4. “Z Tab” mounted to structure with bond or rivet; 5. Strain gage leads interwired and soldered to junction block; and 6. Entire unit covered with protective material. Image Credit: Columbia Research Laboratories, Inc.

Installation of Columbia Strain Sensor. 1. Strain Sensor bonded to surface under test; 2. Leads connected to wire harness; and 3. Coat sensor and wires with waterproofing material.

Installation of Columbia Strain Sensor. 1. Strain Sensor bonded to surface under test; 2. Leads connected to wire harness; and 3. Coat sensor and wires with waterproofing material. Image Credit: Columbia Research Laboratories, Inc.

Ordering Information (Note Sensitive Axis)

Table 4. Source: Columbia Research Laboratories, Inc.

Model Lead Length Compensating Material
DTD2684-1 48" Aluminum 7075-T6 or 7050-T73651, IVD
DTD2684-11 48"
DTD2684-2 24" Steel, AISI 4130 or HP9-4-.20
DTD2684-12 48"
DTD2684-3 48" Titanium TI-6AL-4V Annealed
DTD2684-13 48"
DTD2684-4 24" Carbon/Epoxy MMS 549 Type 1
DTD2684-5 48"
DTD2684-14 48"

 

Advantages

  • Twice as much output
  • A higher level of precision
  • No compromise on structural integrity
  • Installation time is reduced
  • Optimal temperature compensation

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